Tractor-tread link



G. E. SIBBETT. TRACTOR TRE/ID UNK.

APPLICATION FILED IAN-17.11918.

Patented Apr. 27, 1920.r

.103381402' y 2 sHEET`s-sIIET I INVENTOR. Gro er SJBBETT G. E; SIBBEW.'

TRACTOR TREAD LINK.

APPLICMION FILED JAN. I7, 1918. 1,338,402. Patented Apr. 27, 1920.

2 SHEETS-SHEET 2.

' NVENTOR, 'fmef E. 5355517 nUNITED sfrnfrns lerronea E. sinceri?, or B PATENT OFFICE. i

ERKELEY, CALIFORNIA.

. TRACTOReTREAD LINK.

Be it known that I, Grenen E. Sin'r'r, a citizen of the United States, residing at Berkeley, in the county of Alameda, State of California, have invented a new and useful Tractor-Tread Link, of which the following is a specification Ain such `full and clear termsl as will enable those skilled in y the art to construct and use the same.

This invention relates to a link for tractor treads, and its object is to produce a link which will not tend to collect the sand 'and gravel as is commonly the case with such chains. i

Another object of the' invention is to provide means whereby the link will be provided with a heel piece which will prevent the chain from bending in one direction thereby dispensing with the large number of rollers ordinarily used on such treads.

Another object of the invention is to provide means whereby the individual growsers will be movable laterally through a slight angle thereby Y enabling the tractorchain to pass over uneven ground without such great strains -being placed-upon the same 1 as commonly occurs when the growsers are rigidly connected with the chains.

Other objects of the invention will appear as the description proceeds.-

An embodiment of the invention is shown in the drawings in which the same reference numeral is applied to the same portion throughout, but l. am aware that there may be modifications thereof. f

Figure 1- is a perspective view showing a portion of the frame of the tractor, and a portion of the chainused therewith,

Fig. 2 is a side elevation of one of the complete tractor chains and of the wheels and frame-work supported by the chain,

Fig. 3 is an end v-.iew of one of the tractor links in transverse vertical section, and also .illustrating one of the intermediate rollers bearingupon the same,

Fig. 4 is a side elevation of one of the i links,

Fig. 5 is a plan view of one of the. links, Fig. 6 is a bottom plan view of one of the links,

Specification of Letterslatent. Patented Apr, 27, 1920,

, 1918. Serial No. 212,167.

looking from theright Fig. l and showing a growser plate attached thereto.

Fig. 9 is a plan view of one of the connecting pins, and 4 i Fig. 10' is an end view oi" one oi' the con necting pins.

lt will be understood by thosev skilled in the art that commonly tractors of the endless chain type have a pair of chains resting upon the ground, but in the,- present instance only the iframe-work at one si'de of the tractor is shown, and in this drawing the numeral 1 represents one of the side frames, 2 the other side frame, which frames are connected together by means of angle plates 3 and fi, and they may be connected to other parts oi' the tractor not shown by any suitable connections,

At one end of the 'frame there are two, sprocket wheels 5 and 6 revoluble on a shaftv 7 journaled in boxes 8 and 9.'

A At the opposite end ofthe frame there is a plain flanged wheel' 10 around which the chain 11 passes.

p Below the frame-work consisting of the parts 1 and 2 are brackets 12 and 13 which support flanged wheels 14 and 15, said wheels bearing upon the top of the chain of the links providing an extended contact of said chain with the ground. The 'chain comprises a series of links having vertically extending web members 16 and 17, which web members are connected at their` top by anA overhanging cover or plate 18.- Said members l6-and 17 merge at one end into two eyes 19 and 20, and at the other end into a single eye 21 which exactly its'the space between two of the eyes 19 and'20 upon the length. rl`he eve 21 is pronext adjacent heel projection 22, which is vided with a adapted to belinserted under the top por-.-

tion 18 when the chain is assembled to'prevent the chain from bending upwardly between the two rollers 14 and 15. About the center of the link there is a transversely extending web 23 which web has flanges 24,

25 lfor a purpose presently to be explained. The growser plates so 'called are the plates which come in actual contact with the and are indicated at 26, and they ground,

each have two projecting ears 27 which bear upon .the lower side of the flanges 24, 25,

ioo

and are loosely held in position against the same by means of the pin 28.` The growser side to side, the entire series of groivser plates in Contact with the ground moves slightly. The eye 20 has a pocket formed therein at 30, the object being to receive the lug 31 on the pin 32, said pin being held in place by means of a small bolt 33 passing through one of the Walls of the link.

The principal advantage of this type of link lies in the fact that it has two driving surfaces at opposite ends of the pin 32 there by giving great Wearing capacity, and in the use of the flanged rollers 14- and.V l5 which bear upon flat surfaces and do not tend to crowd the dirt and rocks into the body of the link, Whatever dirt may aecumulate being crowded off the chain.

Having thus described my invention what I claim as new and desire to secure by Letters Patent ,of the United. States'is as folloWs:

l. A link for endless chain tractors coin-r prising a flat bearing plate having a. pair of flanges extending therefiroin said link hav` ing a single eye at one end and a double eye at the other end for connecting to the next adjacent links, a tiransverse web Connecting the tvo flanges adjacent their central portions, and a groWser plate pivotally connected to the said transverse web.

ln testimony whereof l have hereunto i, my hand this 7 th day of January fi. D. inl

GEORGE l. SlBl- WIT. 

